iPadOS 12.1.3 (build 16D5037a) is an official Apple over-the-air update for the iPad Pro (10.5-inch, WiFi), released on 2019-01-07T18:06:49Z. The update package is 74.42 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c381f510fe1f81adc31c0f21fbb21979cc331bcb.zip.